US11975470B2ActiveUtilityA1

Heat-seal-laminating PET film

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Assignee: JO IG LAEPriority: Feb 1, 2021Filed: Jan 12, 2022Granted: May 7, 2024
Est. expiryFeb 1, 2041(~14.5 yrs left)· nominal 20-yr term from priority
Inventors:Ig Lae JoYong Je Kang
B29C 48/21B29C 48/022B29C 48/08B29C 66/742B32B 27/08B32B 27/36C08G 63/183C08G 63/916C09J 7/255C09J 7/35B29K 2067/003B32B 2250/244B32B 2264/1021B32B 2270/00B32B 2307/31C09J 2301/304C09J 2467/00B32B 27/18C08J 5/18C08J 2367/02C08K 3/36C08G 63/199C08L 67/02C08G 63/189C08L 2205/03C08L 2205/02B29C 48/305B29C 48/914B29C 48/0018B32B 2581/00B32B 2264/1022B32B 2264/104
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Cited by
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References
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Claims

Abstract

Disclosed is a PET (polyethylene terephthalate) film capable of being laminated by heat sealing on a metal. The PET film is a coextruded PET film including an intermediate layer, and a surface layer and a heat seal layer bound to respective sides of the intermediate layer, the heat seal layer including 100 parts by weight of a PET resin modified simultaneously with 1,4-cyclohexane dimethanol, 1,3-propanediol, and 1,4-butanediol, and 10 to 50 parts by weight of a PET resin modified with isophthalic acid.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A heat-seal-laminating PET (polyethylene terephthalate) film capable of being laminated by heat sealing on a metal,
 wherein the PET film is a coextruded PET film comprising an intermediate layer, and a surface layer and a heat seal layer bound to respective sides of the intermediate layer, and 
 the heat seal layer comprises 100 parts by weight of a PET resin modified simultaneously with 1,4-cyclohexane dimethanol, 1,3-propanediol, and 1,4-butanediol, and 10 to 50 parts by weight of a PET resin modified with isophthalic acid. 
 
     
     
       2. The heat-seal-laminating PET film of  claim 1 , wherein the surface layer comprises 100 parts by weight of a PET resin modified with 1,4-cyclohexane dimethanol, 1 to 5 parts by weight of a PET resin blended with 1 to 20 wt % of inorganic particles selected from the group consisting of silicon dioxide (SiO 2 ), titanium dioxide (TiO 2 ), calcium carbonate (CaCO 3 ), and mixtures thereof, and 2 to 10 parts by weight of a PET resin modified with isophthalic acid. 
     
     
       3. The heat-seal-laminating PET film of  claim 1 , wherein the intermediate layer comprises 100 parts by weight of a PET resin modified with 1,3-propanediol, 50 to 100 parts by weight of a PET resin modified with 1,4-butanediol, and 5 to 15 parts by weight of a PET resin modified with naphthalic acid.

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